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BuildCircuit is an online store for selling electronics kits and components related to Arduino, Raspberry Pi, etc. We operate from Sydney, Australia.

We design and sell basic electronic kits and Arduino modules for all electronics enthusiasts.

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Photoresistor sensor module light detector for Arduino

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AU $4.95
SKU:
BC-68
Shipping:
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Current Stock:
23
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This product is shipped from Sydney, Australia. Worldwide shipping available- we ship to USA, Canada, New Zealand, UK, EU and Non-EU countries.

Photo resistors, also known as light dependent resistors (LDR), are light sensitive components most often used to indicate the presence or absence of light or to measure the light intensity. In the dark, their resistance is very high, up to 1MΩ, but when the LDR sensor is exposed to light, the resistance drops, even down to a few ohms, depending on the light intensity. LDRs have a sensitivity that varies with the wavelength of the light applied and are nonlinear devices.   

Features of this module: 

  • Can detect ambient brightness and light intensity
  • Adjustable sensitivity (via potentiometer)
  • Operating voltage 3.3V-5V
  • Small board PCB size: 3cm * 1.6cm
  • Power indicator (red) and the digital switch output indicator (green)
  • Uses LM393 comparator chip

Pin outs:

  • External 3.3V-5V VCC
  • External GND GND
  • D0 digital output interface, a small plate (0 and 1)
  • A0 analog output interface

How to use:

  • Photosensitive resistor module most sensitive to environmental light intensity is generally used to detect the ambient brightness and light intensity.
  • Module light conditions or light intensity reach the set threshold, DO port output high, when the external ambient light intensity exceeds a set threshold, the module D0 output low;
  • Digital output D0 directly connected to the MCU, and detect high or low TTL, thereby detecting ambient light intensity changes;
  • Digital output module D0  can directly drive the relay module, which can be composed of a photoelectric switch;
  • Analog output module AO and AD modules can be connected through the AD converter, you can get a more accurate light intensity values 
Documents:  

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  1. About the pins

    Posted by Dier Eluom on 6th Sep 2016

    Do you have the code for this or an example that is relevant. The videos are all three pin?? Your sensor is 4 with a pot??

    (This comment has been imported from previous store)

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